The average of 12 numbers is 15, and the average of the first four numbers is 13. What is the average of the remaining numbers?
Answer & explanation
Correct answer: option 1
Let average of remaining 8 numbers is P
According to question ,
12 × 15 = 4 × 13 + 8 × P
180 = 52 + 8P
128 = 8P
P = 16
So , average of remaining 8 numbers is P